You can get holiday lights for cheap, or even free from your neighbor’s trash can—entire strings of lights that already have wires connected to them! This is an international phenomenon; we can get them here in Timor, too. They’re everywhere at Christmas in this Catholic country, and when they stop working in a year or two, we get them for the asking!
What’s more, many of them are now built with LEDs (light-emitting diodes), extraordinarily high-tech bits of solid-state physics that can be used to learn about semiconductors. LEDs also use ...
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